SS 225 Marriage and Family Week 2 PPT

3. Week 3 of gestation
(embryo development);
week 5 of pregnancy:
• The brain, spinal cord,
and heart begin to
develop.
• The gastrointestinal tract
begins to develop.

4. Weeks 4 to 5 of gestation;
week 6 - 7 of pregnancy:
• Arm and leg buds become
visible.
• The brain develops into
five areas and some
cranial nerves are visible.
• The eyes and ear
structures begin to form.
• Tissue forms that
develops into the vertebra
and some other bones.
• The heart continues to
develop and now beats at
a regular rhythm.
• Rudimentary blood moves
through the main vessels.

5. Week 6 of gestation; week
8 of pregnancy:
• The arms and legs have
grown longer, and foot
and hand areas can be
distinguished.
• The hands and feet have
fingers and toes (digits),
but may still be webbed.
• The brain continues to
form.
• The lungs begin to form.

6. Week 8 of gestation;
week 10 of pregnancy:
• The eyelids are more
developed.
• External features of
the ear begin to take
their final shape.
• Facial features
continue to develop.
• The intestines rotate.

7. Weeks 9 to 12 of gestation;
weeks 11 to 14 of pregnancy:
• Eyelids close and will not
reopen until about the 28th
week.
• The face is well formed.
• Limbs are long and thin.
• Genitals appear well
differentiated.
• Red blood cells are produced in
the liver.
• The head makes up nearly half
of the baby's size.
• The baby can make a fist with
its fingers.
• Tooth buds appear for the baby
teeth.

8. Weeks 13 to 19 of gestation;
weeks 15 to 21 of pregnancy:
• The skin is almost transparent.
• Fine hair called lanugo develops on
the head.
• Meconium is made in the intestinal
tract.
• More muscle tissue and bones have
developed, and the bones become
harder.
• The baby begins to make active
movements.
• The liver and pancreas produce fluid
secretions.
• Sucking motions are made with the
mouth.
• The baby can hear.
• The baby makes more movements.
• The mother may feel a fluttering in
the lower abdomen.

9. Week 20 to 23 of gestation;
week 22 to 25 of pregnancy:
• Lanugo hair covers entire body.
• Eyebrows and lashes appear.
• Nails appear on the fingers and toes.
• The baby is more active with
increased muscle development.
• The mother can feel the baby
moving.
• The fetal heartbeat can be heard with
a stethoscope.
• Bone marrow begins to make blood
cells.
• The lower airways of the baby's lungs
develop but still do not produce
surfactant (a substance that allows
the alveoli to open for gas exchange).
• The baby begins to store fat.

10. Week 24 to 28 of gestation;
week 25 to 30 of pregnancy:
• Eyebrows and eyelashes are well
formed.
• All eye parts are developed.
• The baby has a hand and startle
reflex.
• Footprints and fingerprints are
forming.
• Air sacs form in lungs.
• Rapid brain development occurs.
• The nervous system is developed
enough to control some body
functions.
• The eyelids open and close.
• The respiratory system, while
immature, has developed to the
point where gas exchange is
possible.

11. Weeks 29 to 40 of gestation;
weeks 31 to 42 of pregnancy:
• A rapid increase in the amount of
body fat occurs.
• Rhythmic breathing movements
occur, but the lungs are not fully
mature.
• The bones are fully developed, but
still soft and pliable.
• The baby's body begins storing iron,
calcium, and phosphorus.
• Body fat increases.
• Fingernails reach the end of the
fingertips.
• Lanugo is gone except for on the
upper arms and shoulders.
• Fingernails extend beyond
fingertips.
• Small breast buds are present on
both sexes.
• Head hair is now coarse and thicker.